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Kinetically Limited CO Adsorption: Spill‐Over as a Highly Effective Adsorption Pathway on Bimetallic Surfaces
Author(s) -
Hartmann Heinrich,
Diemant Thomas,
Behm R. Jürgen
Publication year - 2013
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201300722
Subject(s) - bimetallic strip , adsorption , monolayer , carbon monoxide , saturation (graph theory) , chemistry , substrate (aquarium) , kinetic energy , chemical engineering , photochemistry , catalysis , inorganic chemistry , organic chemistry , oceanography , physics , mathematics , combinatorics , quantum mechanics , engineering , geology , biochemistry
We demonstrate that the (local) adsorbed carbon monoxide, CO ad , coverage on the Pt‐free areas of bimetallic Pt/Ru(0001) surfaces (a Ru(0001) substrate partly covered by Pt monolayer islands) can be increased to ∼0.80 monolayers (ML), well above the established saturation CO ad coverage of 0.68 ML, even under ultrahigh vacuum conditions by using spill‐over of CO adsorbed on the Pt islands to the Ru areas as an highly effective adsorption channel. The apparent CO ad saturation coverage of 0.68 ML on pure Ru(0001) is identified as due to kinetic limitations, hindering further uptake from the gas phase, rather than being caused by thermodynamic reasons. This spill‐over mechanism is proposed to be a general phenomenon for adsorption on bimetallic surfaces.